I realize this may sound a bit like blasphemy, but I would recommend that you not bother to count in herbs and spices unless you really are pouring them in to your dish. The tiny values will easy fall into your "rounding errors".

Any count you use for any food item is an approximation. That apple might be 22g or it might be 18g depending on how big or small it is, how sugary that variety is, etc. Every food is an approximation. If you start worrying about the 0.1g added by oregano, you are focusing on the tiny details and not the big picture.

I'll also note that while it might seem tempting to eat a ton of salt because it has zero carbs in it, salt is dangerous for your body for other reasons. Go easy on the salt.